I am not using a transaction (see original POST), which is the problem. On Jun 4, 11:03 am, Chau Huynh <cmhu...@gmail.com> wrote: > Did you have different entity groups inside a transaction? > Google have a constraint of what can be done in a transaction > herehttp://code.google.com/appengine/docs/python/datastore/transactions.h... > > On Fri, Jun 4, 2010 at 5:45 PM, JD <liva...@gmail.com> wrote: > > After debugging, I was able to get rid of the exception by removing a > > pm.newQuery() which was happening on a different entity group. > > > To me this is a bug in App Engine, as there is no reason the query on > > a particular entity group should fail outside a transaction. > > > On Jun 3, 12:25 pm, Millisecond <millisec...@gmail.com> wrote: > > > Hmmm. > > > > How is your object model structured? Do entities have other entities > > > as direct references? > > > > If you have "class A { B b }" and setting b to an instance of B that > > > already existed might throw the error you're seeing. > > > > I changed my structure to be "class A { String bKey }" for a variety > > > of other reasons, but guess it also may have gotten around this > > > problem. > > > > Alternatively, post as much code as you can and I'll see if anything > > > else rings a bell, early on I spent a frustrated day or two working > > > around this exception in a variety of places so know it can be > > > frustrating. > > > > -C > > > > On Jun 3, 6:33 am, JD <liva...@gmail.com> wrote: > > > > > I added a call to flush() after every change on the PM-managed object, > > > > but that did not help. > > > > > Also doing a pm.flush() does not throw this exception, but doing a > > > > pm.close() does - which seems to be contrary to your reasoning (I > > > > would expect flush to throw the same exception if multiple entity > > > > groups were at cause). > > > > > On Jun 3, 1:33 am, Millisecond <millisec...@gmail.com> wrote: > > > > > > Even though you're not using transactions, I think it's trying to > > make > > > > > the .close() call atomic (maybe with an internal implicit > > > > > transaction), failing or succeeding as a whole. And as I understand > > > > > it, entities not in the same group can be stored on separate machines > > > > > so can't be operated on atomically. > > > > > > I've worked around this by calling a flush() after most any change on > > > > > a PM-managed object until close(). If this has a huge number of > > reqs/ > > > > > s, you may want to re-architect to get the objects in the same entity > > > > > group as multiple flushes won't be very efficient. > > > > > > -C > > > > > > On Jun 2, 8:26 pm, JD <liva...@gmail.com> wrote: > > > > > > > I have a PersistenceManager > > > > > > > PersistenceManager pm = PMF.get().getPersistenceManager(); > > > > > > > which I use to do a bunch of operations on different objects, but > > > > > > WITHOUT transaction (run queries, store entities and lookup > > entities). > > > > > > > I then close the manager with pm.close() and get this obscure error > > > > > > that complains about multiple entity groups inside a transaction > > even > > > > > > though I am not using a transaction (you will notice that the error > > is > > > > > > not the usual one where it prints the different entity groups). > > > > > > > I am not 100% confident but have the impression that this error > > > > > > started happening with the 1.3.4 release. > > > > > > 100% reproducible use case. Would appreciate input from App Engine > > > > > > developers. > > > > > > > com.myapp.servlet.task.PopulateUserPages doAction: Illegal argument > > > > > > javax.jdo.JDOFatalUserException: Illegal argument > > > > > > at > > > org.datanucleus.jdo.NucleusJDOHelper.getJDOExceptionForNucleusException(Nuc > > leusJDOHelper.java: > > > > > > 344) > > > > > > at > > > org.datanucleus.jdo.JDOPersistenceManager.close(JDOPersistenceManager.java: > > > > > > 281) > > > > > > at > > com.myapp.dao.jdo.DatastoreService.release(DatastoreService.java: > > > > > > 631) > > > > > > at > > > com.myapp.servlet.AbstractBaseServlet.releaseService(AbstractBaseServlet.ja > > va: > > > > > > 243) > > > > > > at > > > com.myapp.servlet.task.PopulateUserPages.doAction(PopulateUserPages.java: > > > > > > 132) > > > > > > at > > com.myapp.servlet.task.Dispatcher.doAction(Dispatcher.java:35) > > > > > > at > > com.myapp.servlet.task.TaskServlet.doAction(TaskServlet.java:36) > > > > > > at > > > com.myapp.servlet.AbstractBaseServlet.doGenericAction(AbstractBaseServlet.j > > ava: > > > > > > 194) > > > > > > at > > > com.myapp.servlet.AbstractBaseServlet.doPost(AbstractBaseServlet.java: > > > > > > 84) > > > > > > at > > javax.servlet.http.HttpServlet.service(HttpServlet.java:713) > > > > > > at > > javax.servlet.http.HttpServlet.service(HttpServlet.java:806) > > > > > > at > > org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java: > > > > > > 511) > > > > > > at org.mortbay.jetty.servlet.ServletHandler > > > > > > $CachedChain.doFilter(ServletHandler.java:1166) > > > > > > at > > > com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlo > > bUploadFilter.java: > > > > > > 97) > > > > > > at org.mortbay.jetty.servlet.ServletHandler > > > > > > $CachedChain.doFilter(ServletHandler.java:1157) > > > > > > at > > > com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionF > > ilter.java: > > > > > > 35) > > > > > > at org.mortbay.jetty.servlet.ServletHandler > > > > > > $CachedChain.doFilter(ServletHandler.java:1157) > > > > > > at > > > com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(Trans > > actionCleanupFilter.java: > > > > > > 43) > > > > > > at org.mortbay.jetty.servlet.ServletHandler > > > > > > $CachedChain.doFilter(ServletHandler.java:1157) > > > > > > at > > > org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java: > > > > > > 388) > > > > > > at > > > org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java: > > > > > > 216) > > > > > > at > > > org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java: > > > > > > 182) > > > > > > at > > > org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java: > > > > > > 765) > > > > > > at > > org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java: > > > > > > 418) > > > > > > at > > > com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionH > > andlerMap.java: > > > > > > 238) > > > > > > at > > > org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java: > > > > > > 152) > > > > > > at org.mortbay.jetty.Server.handle(Server.java:326) > > > > > > at > > org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java: > > > > > > 542) > > > > > > at org.mortbay.jetty.HttpConnection > > > > > > $RequestHandler.headerComplete(HttpConnection.java:923) > > > > > > at > > > com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequ > > estParser.java: > > > > > > 76) > > > > > > at > > org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) > > > > > > at > > > com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceReques > > t(JettyServletEngineAdapter.java: > > > > > > 135) > > > > > > at > > > com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java: > > > > > > 250) > > > > > > at com.google.apphosting.base.RuntimePb$EvaluationRuntime > > > > > > $6.handleBlockingRequest(RuntimePb.java:5838) > > > > > > at com.google.apphosting.base.RuntimePb$EvaluationRuntime > > > > > > $6.handleBlockingRequest(RuntimePb.java:5836) > > > > > > at > > > com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest(BlockingAp > > plicationHandler.java: > > > > > > 24) > > > > > > at > > com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java: > > > > > > 398) > > > > > > at com.google.net.rpc.impl.Server$2.run(Server.java:852) > > > > > > at > > > com.google.tracing.LocalTraceSpanRunnable.run(LocalTraceSpanRunnable.java: > > > > > > 56) > > > > > > at > > > com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan(LocalTraceSpa > > nBuilder.java: > > > > > > 576) > > > > > > at com.google.net.rpc.impl.Server.startRpc(Server.java:807) > > > > > > at > > com.google.net.rpc.impl.Server.processRequest(Server.java:369) > > > > > > at > > > com.google.net.rpc.impl.ServerConnection.messageReceived(ServerConnection.j > > ava: > > > > > > 442) > > > > > > at > > > com.google.net.rpc.impl.RpcConnection.parseMessages(RpcConnection.java: > > > > > > 319) > > > > > > at > > > com.google.net.rpc.impl.RpcConnection.dataReceived(RpcConnection.java: > > > > > > 290) > > > > > > at > > com.google.net.async.Connection.handleReadEvent(Connection.java: > > > > > > 474) > > > > > > at > > > com.google.net.async.EventDispatcher.processNetworkEvents(EventDispatcher.j > > ava: > > > > > > 831) > > > > > > at > > > com.google.net.async.EventDispatcher.internalLoop(EventDispatcher.java: > > > > > > 207) > > > > > > at > > com.google.net.async.EventDispatcher.loop(EventDispatcher.java: > > > > > > 103) > > > > > > at > > > com.google.net.rpc.RpcService.runUntilServerShutdown(RpcService.java: > > > > > > 251) > > > > > > at com.google.apphosting.runtime.JavaRuntime > > > > > > $RpcRunnable.run(JavaRuntime.java:413) > > > > > > at java.lang.Thread.run(Unknown Source) > > > > > > NestedThrowablesStackTrace: > > > > > > java.lang.IllegalArgumentException: can't operate on multiple > > entity > > > > > > groups in a single transaction. > > > > > > at > > > com.google.appengine.api.datastore.DatastoreApiHelper.translateError(Datast > > oreApiHelper.java: > > > > > > 34) > > > > > > at > > > com.google.appengine.api.datastore.DatastoreApiHelper.makeSyncCall(Datastor > > eApiHelper.java: > > > > > > 67) > > > > > > at > > ... > > read more »
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